Mitsubishi Melsec-L Series User Manual page 124

Specified device
(Word)
+0
Data length storage area
+1
Data storage area
+n
*1 The unit of data length is byte.
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(b) When "Fixed Length/Variable Length" is "Variable Length"
An area starting from the device number which is specified on the Element
Setting screen +1 is considered as the data storage area.
The data storage area to be occupied varies depending on the setting of
"Unit of Stored Data".
When "Lower Byte + Upper Byte" is selected, the same size as the
data length + one word (length for the data length storage area) are
occupied.
(However, when the data length of a send packet is an odd number,
the upper byte (lower byte for "Byte Swap") of the last device is not
transmitted. When the data length of a receive packet is an odd
number, one byte of 00
When "Lower Bytes Only" is selected, twice size of the data length +
one word (length for the data length storage area) are occupied.
Send packet: Users store the send data length (data length on the line)
*1
Receive packet: The C24 stores the receive data length (data length on the line)
Send packet: Users store the send data
Receive packet: The C24 stores the receive data
9 DATA COMMUNICATION USING THE PREDEFINED PROTOCOL
is added to the last data and stored.)
H
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